tdf#151172 crash in notebookbar with extension enabled

Change-Id: I60d777b27ffee095807490f4b181b1b08ed88462
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/140683
Tested-by: Jenkins
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>
diff --git a/framework/source/uielement/generictoolbarcontroller.cxx b/framework/source/uielement/generictoolbarcontroller.cxx
index f61a0d0..1fd8998 100644
--- a/framework/source/uielement/generictoolbarcontroller.cxx
+++ b/framework/source/uielement/generictoolbarcontroller.cxx
@@ -356,8 +356,9 @@ ImageOrientationController::ImageOrientationController(const Reference<XComponen
void ImageOrientationController::dispose()
{
    ToolboxController::dispose();
    if (!m_pToolbar)
        VCLUnoHelper::GetWindow(getParent())->RemoveEventListener(LINK(this, ImageOrientationController, WindowEventListener));
    VclPtr<vcl::Window> pWindow = VCLUnoHelper::GetWindow(getParent());
    if (pWindow)
        pWindow->RemoveEventListener(LINK(this, ImageOrientationController, WindowEventListener));
}

IMPL_LINK(ImageOrientationController, WindowEventListener, VclWindowEvent&, rWindowEvent, void)